Starlight: List of Problems

Over 20,000 problems available. AMC 8/10/12 and AIME problems from 2010-2023; USAJMO/USAMO problems from 2002-2023 available. USACO problems from 2014 to 2023 (all divisions). Codeforces, AtCoder, DMOJ problems are added daily around 04:00 AM UTC, which may cause disruptions.

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AMC 8: [year] AMC 8 Problem #, Ex: 2013 AMC 8 Problem 1
AMC 10: [year] AMC 10A Problem # OR [year] AMC 10B Problem #, Ex: 2015 AMC 10A Problem 16
AMC 12: [year] AMC 12A Problem # OR [year] AMC 12B Problem #, Ex: 2021 AMC 12B Problem 25
AIME: [year] AIME I Problem # OR [year] AIME II Problem #, Ex: 2013 AIME I Problem 8
USAJMO/USAMO: [year] USAJMO/USAMO Problem #, Ex: 2023 USAJMO Problem 1
Codeforces: Codeforces [contest id (e.g. 101)][problem id (e.g. A, B, C)]: [Codeforces problem name], Ex: Codeforces 1336F: Journey
AtCoder: AtCoder [contest id (e.g. ABC314, ARC164, ZONE2021)]: [problem id (A, B, C)]. [Problem name], Ex: AtCoder ZONE2021: E. Sneaking
DMOJ: DMOJ [contest name (if applicable)] [problem number (e.g. P1)] - [Problem name], Ex: DMOJ Yet Another Contest 3 P1 - Shell Swap Scam
USACO: [year] [contest month (e.g. January, US Open)], [division (e.g. Gold)]: [Problem name], Ex: USACO 2023 US Open Contest, Bronze: Rotate and Shift

ID	Problem Name (click to add insights/hints, view summary of insights/hints and similar problems)
13801	AtCoder PAKENCAMP-2021-DAY3: D. 試験作り
13800	AtCoder PAKENCAMP-2021-DAY3: C. Sum of Digit Sum
13799	AtCoder PAKENCAMP-2021-DAY3: B. レートで2分割！
13798	AtCoder PAKENCAMP-2021-DAY3: A. 出欠確認
13797	AtCoder PAKENCAMP-2021-DAY2: P. A^k=k
13796	AtCoder PAKENCAMP-2021-DAY2: O. Golf
13795	AtCoder PAKENCAMP-2021-DAY2: N. Polynomial Comparison
13794	AtCoder PAKENCAMP-2021-DAY2: M. Deque and Inversions
13793	AtCoder PAKENCAMP-2021-DAY2: L. ジグザグ道
13792	AtCoder PAKENCAMP-2021-DAY2: K. Bracket Inserting
13791	AtCoder PAKENCAMP-2021-DAY2: J. Min-Max Sequence
13790	AtCoder PAKENCAMP-2021-DAY2: I. Multiple Swap
13789	AtCoder PAKENCAMP-2021-DAY2: H. PuraPrime
13788	AtCoder PAKENCAMP-2021-DAY2: G. 進撃のパ研
13787	AtCoder PAKENCAMP-2021-DAY2: F. Fraction
13786	AtCoder PAKENCAMP-2021-DAY2: E. Banned Palindromes
13785	AtCoder PAKENCAMP-2021-DAY2: D. 選択問題の正答はすべて同じ選択肢で…
13784	AtCoder PAKENCAMP-2021-DAY2: C. Participants 3
13783	AtCoder PAKENCAMP-2021-DAY2: B. Pasokon Power
13782	AtCoder PAKENCAMP-2021-DAY2: A. Participants 2
13781	AtCoder PAKENCAMP-2020-DAY2: H. 旅立ちの日に
13780	AtCoder PAKENCAMP-2020-DAY2: G. 旅人計画問題
13779	AtCoder PAKENCAMP-2020-DAY2: F. 来年も本選に20人送り込むので覚悟しておいてください
13778	AtCoder PAKENCAMP-2020-DAY2: E. 老朽化対策
13777	AtCoder PAKENCAMP-2020-DAY2: D. Animal Show
13776	AtCoder PAKENCAMP-2020-DAY2: C. A + B
13775	AtCoder PAKENCAMP-2020-DAY2: B. Walking
13774	AtCoder PAKENCAMP-2020-DAY2: A. Participants
13773	AtCoder PAKENCAMP-2020-DAY1: O. Xor Sum Sum
13772	AtCoder PAKENCAMP-2020-DAY1: N. 背の順
13771	AtCoder PAKENCAMP-2020-DAY1: M. 貢ぎ物
13770	AtCoder PAKENCAMP-2020-DAY1: L. のびたす
13769	AtCoder PAKENCAMP-2020-DAY1: K. Gcd of Sum
13768	AtCoder PAKENCAMP-2020-DAY1: J. Output-only
13767	AtCoder PAKENCAMP-2020-DAY1: I. くねくね
13766	AtCoder PAKENCAMP-2020-DAY1: H. その計算、合ってますか？
13765	AtCoder PAKENCAMP-2020-DAY1: G. 同意書
13764	AtCoder PAKENCAMP-2020-DAY1: F. Fibonaccyan
13763	AtCoder PAKENCAMP-2020-DAY1: E. Amary
13762	AtCoder PAKENCAMP-2020-DAY1: D. 立方体を壊せ！
13761	AtCoder PAKENCAMP-2020-DAY1: C. 皆勤賞
13760	AtCoder PAKENCAMP-2020-DAY1: B. パ研合宿2403
13759	AtCoder PAKENCAMP-2020-DAY1: A. パ研合宿2020
13758	AtCoder PAKENCAMP-2019-DAY4: H. 板の重なり
13757	AtCoder PAKENCAMP-2019-DAY4: G. 三つの条件
13756	AtCoder PAKENCAMP-2019-DAY4: F. イーハチはやる
13755	AtCoder PAKENCAMP-2019-DAY4: E. IOI のために
13754	AtCoder PAKENCAMP-2019-DAY4: D. リミックスジュース
13753	AtCoder PAKENCAMP-2019-DAY4: C. 罰ゲーム
13752	AtCoder PAKENCAMP-2019-DAY4: B. 情報の伝達

Problem Name (click to add insights/hints, view summary of insights/hints and similar problems)

13801

AtCoder PAKENCAMP-2021-DAY3: D. 試験作り

13800

AtCoder PAKENCAMP-2021-DAY3: C. Sum of Digit Sum

13799

AtCoder PAKENCAMP-2021-DAY3: B. レートで2分割！

13798

AtCoder PAKENCAMP-2021-DAY3: A. 出欠確認

13797

AtCoder PAKENCAMP-2021-DAY2: P. A^k=k

13796